Recipe Scaler Calculator
Scales every ingredient by desired ÷ original servings with exact fractions — 1/2 cup for 4 becomes exactly 3/4 cup for 6 — and keeps your units as typed.
Servings
Enter the original and desired servings (both above zero). Blank is not zero.
Ingredients
Scaling is arithmetic only. Cooking and resting times, pan size, oven temperature, seasoning and leavening often do not scale in proportion — adjust those by judgement. This tool gives no substitution, allergy or food-safety advice.
How to use this calculator
- Enter the original servings and the servings you want.
- Add each ingredient with its amount (2, 1.5, 1/2, 1 1/2 or ½) and unit; tick “Do not scale” for anything you want to keep as is.
- Read the exact scaled amounts; optionally add a practical rounding column, then copy the list or download a CSV.
How it works
Multiplier = desired servings ÷ original servings; new amount = original amount × multiplier. Both are exact fractions, and nothing is rounded before scaling.
Practical rounding (to 1/8, 1/4, common kitchen measures or whole numbers) is a separate column that shows how far it moves from the exact amount.
Units are kept exactly as typed and never converted: cups (volume) and grams (mass) stay separate, because converting needs an ingredient-specific density that this tool does not guess.
Worked example
4 → 6 servings. Multiplier = 6 ÷ 4 = 3/2 = 1.5. So 1/2 cup milk → 3/4 cup, 2 eggs → 3, 1 1/3 cups flour → 2 cups and 125 g butter → 187 1/2 g (187.5 g).
Tips
- Runs entirely in your browser. Your inputs are not saved or transmitted.
Frequently asked questions
Do cooking times scale too?
Not reliably. Cooking and resting times, pan size and oven temperature depend on depth and shape rather than quantity, so adjust them by judgement and check for doneness.
Why not convert cups to grams?
A cup of flour and a cup of sugar weigh different amounts, so converting volume to mass needs a density for each ingredient. Rather than guess, the scaler keeps each unit as you entered it.
Can some ingredients be excluded?
Yes — tick “Do not scale” on a row (for example salt or a pinch of spice) and it stays at the original amount. The tool makes no automatic seasoning, leavening or substitution adjustments.
Privacy?
Runs entirely in your browser. Your inputs are not saved or transmitted.
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Cite this tool
Zerdly. (2026). Recipe Scaler Calculator. Retrieved from https://www.zerdly.com/tools/recipe-scaler-calculator/
Tip: Enter any known values to calculate the remaining results.
Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.